How do you guys feel about synthetic oil and synthetic diff lube and synthetic trans fluid.

 

I run full synthetic in the motor, tranny, transfer and differential.

 

I dont use synthetic because
1. too expensive
2. I'm ****, so I need to change my oil every 3 months and that way I'd be wasting synthetic.
3. I'm happy with the normal Mobil oil I use

 

I run synethic in all of my vehicles, I would not run anything else. Most of the trucks that my family has owned got over 500,000 miles on the original engine, that is 300,000 - 350,000 miles more than what most people keep there vehicles for.

 

I've just switched to Mobil 1 in the truck. I still change the oil every 3k miles but I figured since I'm about to hit the 50k mark, might as well switch just to add a little extra insurance for to get as much life as possible. Makes it easier to keep things straight too, since it's the same oil that goes in my car.

 

ive used Amsoil in my truck since i bought it (used)had its performed better and gotten better gas milage then before. Only reason i know this is i bought it from a friend.

 

Both vehicles:

Mobil1 engine oil
Mobil1 rear diff
Redline ATF
Redline PS (car only, haven't touch the truck)

 

I use synthetic everywhere but my trans. (I've heard mixed information about synthetic trans fluid)

 

I use Amsoil. I use GM Dexron III ATF and will do my second flush at 30000 miles. I change my oil when the DIC says to and that seems to be well short of what the synthetic is good for.

 

I run German Castrol in the motor. But Do not use synthetic in trans.